CVE-2013-4566
mod_nss 1.0.8 and earlier, when NSSVerifyClient is set to none for the server/vhost context, does...
mod_nss 1.0.8 and earlier, when NSSVerifyClient is set to none for the server/vhost context, does not enforce the NSSVerifyClient setting in the directory context, which allows remote attackers to bypass intended access restrictions.
Exploit likelihood
What each source reports
NVD Score used
4.0
mod_nss 1.0.8 and earlier, when NSSVerifyClient is set to none for the server/vhost context, does not enforce the NSSVerifyClient setting in the directory context, which allows remote attackers to bypass intended access restrictions.
- Record
CVE-2013-4566- CVSS 2.0
- 4.0 Medium
AV:N/AC:H/Au:N/C:P/I:P/A:N - Weakness
- CWE-264
- Updated
- 2026-11-02
CVE List No score
mod_nss 1.0.8 and earlier, when NSSVerifyClient is set to none for the server/vhost context, does not enforce the NSSVerifyClient setting in the directory context, which allows remote attackers to bypass intended access restrictions.
- Record
CVE-2013-4566- Updated
- 2026-11-02
EUVDEUVD-2013-4424 No score
mod_nss 1.0.8 and earlier, when NSSVerifyClient is set to none for the server/vhost context, does not enforce the NSSVerifyClient setting in the directory context, which allows remote attackers to bypass intended access restrictions.
- Record
EUVD-2013-4424- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-c4hv-94wj-93p7 No score
mod_nss 1.0.8 and earlier, when NSSVerifyClient is set to none for the server/vhost context, does...
mod_nss 1.0.8 and earlier, when NSSVerifyClient is set to none for the server/vhost context, does not enforce the NSSVerifyClient setting in the directory context, which allows remote attackers to bypass intended access restrictions.
- Record
GHSA-c4hv-94wj-93p7- Updated
- 2026-11-02
OSVMGASA-2013-0381 No score
Updated apache-mod_nss package fixes CVE-2013-4566
Updated apache-mod_nss package fixes security vulnerability:
A flaw was found in the way mod_nss handled the NSSVerifyClient setting for the per-directory context. When configured to not require a client certificate for the initial connection and only require it for a specific directory, mod_nss failed to enforce this requirement and allowed a client to access the directory when no valid client certificate was provided (CVE-2013-4566).
- Record
MGASA-2013-0381- Updated
- 2026-11-02
OSVopenSUSE-SU-2024:10311-1 No score
apache2-mod_nss-1.0.14-4.1 on GA media
These are all security issues fixed in the apache2-mod_nss-1.0.14-4.1 package on the GA media of openSUSE Tumbleweed.
- Record
openSUSE-SU-2024:10311-1- Updated
- 2026-11-02
Show 5 moreShow less
OSVSUSE-RU-2015:0591-1 No score
Recommended update for apache2-mod_nss
This update brings several improvements to apache2-mod_nss.
*
More TLS 1.2 ciphers have been added, including AES-GCM and Camelia
ciphers. These can be selected by their tags:
o rsa_aes_128_sha256
o rsa_aes_128_gcm_sha
o rsa_aes_256_sha256
o rsa_camellia_128_sha
o rsa_camellia_256_sha
o ecdh_ecdsa_aes_128_gcm_sha
o ecdhe_ecdsa_aes_128_sha256
o ecdhe_ecdsa_aes_128_gcm_sha
o ecdh_rsa_aes_128_gcm_sha
o ecdhe_rsa_aes_128_sha256
*
The mod_nss.conf.in template was updated to include those ciphers.
(bnc#863035)
*
VirtualHost settings in /etc/apache2/conf.d/mod_nss.conf is now
externalized to /etc/apache2/vhosts.d/vhost-nss.template and not
activated/read by default. (bnc#878681)
*
The Server Name Indication (SNI) extension was implemented.
*
Reading the pass phrase during start-up was improved. (bnc#863518)
- Record
SUSE-RU-2015:0591-1- Updated
- 2026-11-02
OSVSUSE-SU-2016:2285-1 No score
Security update for apache2-mod_nss
This update provides apache2-mod_nss 1.0.14, which brings several fixes and enhancements:
- Fix OpenSSL ciphers stopped parsing at +. (CVE-2016-3099)
- Created valgrind suppression files to ease debugging.
- Implement SSL_PPTYPE_FILTER to call executables to get the key password pins.
- Improvements to migrate.pl.
- Update default ciphers to something more modern and secure.
- Check for host and netstat commands in gencert before trying to use them.
- Add server support for DHE ciphers.
- Extract SAN from server/client certificates into env
- Fix memory leaks and other coding issues caught by clang analyzer.
- Add support for Server Name Indication (SNI).
- Add support for SNI for reverse proxy connections.
- Add RenegBufferSize? option.
- Add support for TLS Session Tickets (RFC 5077).
- Fix logical AND support in OpenSSL cipher compatibility.
- Correctly handle disabled ciphers. (CVE-2015-5244)
- Implement a slew more OpenSSL cipher macros.
- Fix a number of illegal memory accesses and memory leaks.
- Support for SHA384 ciphers if they are available in NSS.
- Add compatibility for mod_ssl-style cipher definitions.
- Add TLSv1.2-specific ciphers.
- Completely remove support for SSLv2.
- Add support for sqlite NSS databases.
- Compare subject CN and VS hostname during server start up.
- Add support for enabling TLS v1.2.
- Don't enable SSL 3 by default. (CVE-2014-3566)
- Fix CVE-2013-4566.
- Move nss_pcache to /usr/libexec.
- Support httpd 2.4+.
- Use apache2-systemd-ask-pass to prompt for a certificate passphrase. (bsc#972968, bsc#975394)
- Record
SUSE-SU-2016:2285-1- Updated
- 2026-11-02
OSVSUSE-SU-2016:2329-1 No score
Security update for apache2-mod_nss
This update provides apache2-mod_nss 1.0.14, which brings several fixes and enhancements:
- SHA256 cipher names change spelling from *_sha256 to *_sha_256.
- Drop mod_nss_migrate.pl and use upstream migrate script instead.
- Check for Apache user owner/group read permissions of NSS database at startup.
- Update default ciphers to something more modern and secure.
- Check for host and netstat commands in gencert before trying to use them.
- Don't ignore NSSProtocol when NSSFIPS is enabled.
- Use proper shell syntax to avoid creating /0 in gencert.
- Add server support for DHE ciphers.
- Extract SAN from server/client certificates into env.
- Fix memory leaks and other coding issues caught by clang analyzer.
- Add support for Server Name Indication (SNI)
- Add support for SNI for reverse proxy connections.
- Add RenegBufferSize? option.
- Add support for TLS Session Tickets (RFC 5077).
- Implement a slew more OpenSSL cipher macros.
- Fix a number of illegal memory accesses and memory leaks.
- Support for SHA384 ciphers if they are available in the version of NSS mod_nss is built against.
- Add the SECURE_RENEG environment variable.
- Add some hints when NSS database cannot be initialized.
- Code cleanup including trailing whitespace and compiler warnings.
- Modernize autotools configuration slightly, add config.h.
- Add small test suite for SNI.
- Add compatibility for mod_ssl-style cipher definitions.
- Add Camelia ciphers.
- Remove Fortezza ciphers.
- Add TLSv1.2-specific ciphers.
- Initialize cipher list when re-negotiating handshake.
- Completely remove support for SSLv2.
- Add support for sqlite NSS databases.
- Compare subject CN and VS hostname during server start up.
- Add support for enabling TLS v1.2.
- Don't enable SSL 3 by default. (CVE-2014-3566)
- Improve protocol testing.
- Add nss_pcache man page.
- Fix argument handling in nss_pcache.
- Support httpd 2.4+.
- Allow users to configure a helper to ask for certificate passphrases via NSSPassPhraseDialog. (bsc#975394)
- Record
SUSE-SU-2016:2329-1- Updated
- 2026-11-02
OSVSUSE-SU-2016:2396-1 No score
Security update for apache2-mod_nss
This update provides apache2-mod_nss 1.0.14, which brings several fixes and enhancements:
- Fix OpenSSL ciphers stopped parsing at +. (CVE-2016-3099)
- Created valgrind suppression files to ease debugging.
- Implement SSL_PPTYPE_FILTER to call executables to get the key password pins.
- Improvements to migrate.pl.
- Update default ciphers to something more modern and secure.
- Check for host and netstat commands in gencert before trying to use them.
- Add server support for DHE ciphers.
- Extract SAN from server/client certificates into env
- Fix memory leaks and other coding issues caught by clang analyzer.
- Add support for Server Name Indication (SNI).
- Add support for SNI for reverse proxy connections.
- Add RenegBufferSize? option.
- Add support for TLS Session Tickets (RFC 5077).
- Fix logical AND support in OpenSSL cipher compatibility.
- Correctly handle disabled ciphers. (CVE-2015-5244)
- Implement a slew more OpenSSL cipher macros.
- Fix a number of illegal memory accesses and memory leaks.
- Support for SHA384 ciphers if they are available in NSS.
- Add compatibility for mod_ssl-style cipher definitions.
- Add TLSv1.2-specific ciphers.
- Completely remove support for SSLv2.
- Add support for sqlite NSS databases.
- Compare subject CN and VS hostname during server start up.
- Add support for enabling TLS v1.2.
- Don't enable SSL 3 by default. (CVE-2014-3566)
- Fix CVE-2013-4566.
- Move nss_pcache to /usr/libexec.
- Support httpd 2.4+.
- SHA256 cipher names change spelling from *_sha256 to *_sha_256.
- Use apache2-systemd-ask-pass to prompt for a certificate passphrase. (bsc#972968, bsc#975394)
- Record
SUSE-SU-2016:2396-1- Updated
- 2026-11-02
OSVUBUNTU-CVE-2013-4566 No score
mod_nss 1.0.8 and earlier, when NSSVerifyClient is set to none for the server/vhost context, does not enforce the NSSVerifyClient setting in the directory context, which allows remote attackers to bypass intended access restrictions.
- Record
UBUNTU-CVE-2013-4566- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
apache-mod_nssMageia:3 |
before 1.0.8-16.4.mga3 | 1.0.8-16.4.mga3 |
mod_nssRed Hat:enterprise_linux:5::client |
before 0:1.0.8-8.el5_10 | 0:1.0.8-8.el5_10 |
mod_nss-debuginfoRed Hat:enterprise_linux:5::client |
before 0:1.0.8-8.el5_10 | 0:1.0.8-8.el5_10 |
mod_nssRed Hat:enterprise_linux:5::server |
before 0:1.0.8-8.el5_10 | 0:1.0.8-8.el5_10 |
mod_nss-debuginfoRed Hat:enterprise_linux:5::server |
before 0:1.0.8-8.el5_10 | 0:1.0.8-8.el5_10 |
mod_nssRed Hat:enterprise_linux:6::client |
before 0:1.0.8-19.el6_5 | 0:1.0.8-19.el6_5 |
mod_nss-debuginfoRed Hat:enterprise_linux:6::client |
before 0:1.0.8-19.el6_5 | 0:1.0.8-19.el6_5 |
mod_nssRed Hat:enterprise_linux:6::computenode |
before 0:1.0.8-19.el6_5 | 0:1.0.8-19.el6_5 |
mod_nss-debuginfoRed Hat:enterprise_linux:6::computenode |
before 0:1.0.8-19.el6_5 | 0:1.0.8-19.el6_5 |
mod_nssRed Hat:enterprise_linux:6::server |
before 0:1.0.8-19.el6_5 | 0:1.0.8-19.el6_5 |
Show 19 moreShow less
| Package | Affected | Fixed |
|---|---|---|
mod_nss-debuginfoRed Hat:enterprise_linux:6::server |
before 0:1.0.8-19.el6_5 | 0:1.0.8-19.el6_5 |
mod_nssRed Hat:enterprise_linux:6::workstation |
before 0:1.0.8-19.el6_5 | 0:1.0.8-19.el6_5 |
mod_nss-debuginfoRed Hat:enterprise_linux:6::workstation |
before 0:1.0.8-19.el6_5 | 0:1.0.8-19.el6_5 |
apache2-mod_nssSUSE:Linux Enterprise Server 12 SP1 From an advisory covering 4 CVEs |
before 1.0.14-18.3 | 1.0.14-18.3 |
apache2-mod_nssSUSE:Linux Enterprise Server for SAP Applications 12 SP1 From an advisory covering 4 CVEs |
before 1.0.14-18.3 | 1.0.14-18.3 |
apache2-mod_nssSUSE:OpenStack Cloud 5 From an advisory covering 2 CVEs |
before 1.0.14-0.4.25.1 | 1.0.14-0.4.25.1 |
apache2-mod_nssSUSE:Manager 2.1 From an advisory covering 2 CVEs |
before 1.0.14-0.4.25.1 | 1.0.14-0.4.25.1 |
apache2-mod_nssSUSE:Manager Proxy 2.1 From an advisory covering 2 CVEs |
before 1.0.14-0.4.25.1 | 1.0.14-0.4.25.1 |
apache2-mod_nssSUSE:Linux Enterprise Point of Sale 11 SP3 From an advisory covering 2 CVEs |
before 1.0.14-0.4.25.1 | 1.0.14-0.4.25.1 |
apache2-mod_nssSUSE:Linux Enterprise Server 11 SP2-LTSS From an advisory covering 2 CVEs |
before 1.0.14-0.4.25.1 | 1.0.14-0.4.25.1 |
apache2-mod_nssSUSE:Linux Enterprise Server 11 SP3-LTSS From an advisory covering 2 CVEs |
before 1.0.14-0.4.25.1 | 1.0.14-0.4.25.1 |
apache2-mod_nssSUSE:Linux Enterprise Server 11 SP3-TERADATA From an advisory covering 2 CVEs |
before 1.0.14-0.4.25.1 | 1.0.14-0.4.25.1 |
apache2-mod_nssSUSE:Linux Enterprise Server 11 SP4 From an advisory covering 2 CVEs |
before 1.0.14-0.4.25.1 | 1.0.14-0.4.25.1 |
apache2-mod_nssSUSE:Linux Enterprise Server for SAP Applications 11 SP4 From an advisory covering 2 CVEs |
before 1.0.14-0.4.25.1 | 1.0.14-0.4.25.1 |
apache2-mod_nssSUSE:Linux Enterprise Server for SAP Applications 12 From an advisory covering 4 CVEs |
before 1.0.14-10.14.3 | 1.0.14-10.14.3 |
apache2-mod_nssSUSE:Linux Enterprise Server 12-LTSS From an advisory covering 4 CVEs |
before 1.0.14-10.14.3 | 1.0.14-10.14.3 |
libapache2-mod-nssUbuntu:16.04:LTS |
All versions, plus listed versions 1.0.11-11.0.12-11.0.12-2 |
None known |
libapache2-mod-nssUbuntu:18.04:LTS |
All versions, plus listed versions 1.0.14-1build1 |
None known |
apache2-mod_nssopenSUSE:Tumbleweed From an advisory covering 4 CVEs |
before 1.0.14-4.1 | 1.0.14-4.1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected, facts | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2013-4566 is a medium vulnerability (CVSS 4.0) in Mod Nss Project Nss, published December 12, 2013. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.95%, the 80th percentile. Fixed in apache-mod_nss 1.0.8-16.4.mga3.
References
bugzilla.redhat.com/show_bug.cgi?id=1016832
rhn.redhat.com/errata/RHSA-2013-1779.html
lists.opensuse.org/opensuse-updates/2013-12/msg00118.html
nvd.nist.gov/vuln/detail/CVE-2013-4566
github.com/advisories/GHSA-c4hv-94wj-93p7
advisories.mageia.org/MGASA-2013-0381.html
Show 27 moreShow less
bugs.mageia.org/show_bug.cgi?id=11872
access.redhat.com/errata/RHSA-2013:1779
access.redhat.com/security/updates/classification
security.access.redhat.com/data/csaf/v2/advisories/2013/rhsa-2013_1779.json
access.redhat.com/security/cve/CVE-2013-4566
cve.org/CVERecord?id=CVE-2013-4566
suse.com/support/update/announcement//suse-ru-20150591-1
bugzilla.suse.com/847216
bugzilla.suse.com/853039
bugzilla.suse.com/863035
bugzilla.suse.com/863518
bugzilla.suse.com/864929
bugzilla.suse.com/878681
bugzilla.suse.com/897712
bugzilla.suse.com/902068
suse.com/security/cve/CVE-2013-4566
suse.com/support/update/announcement/2016/suse-su-20162285-1
bugzilla.suse.com/972968
bugzilla.suse.com/975394
bugzilla.suse.com/979688
suse.com/security/cve/CVE-2014-3566
suse.com/security/cve/CVE-2015-5244
suse.com/security/cve/CVE-2016-3099
suse.com/support/update/announcement/2016/suse-su-20162329-1
suse.com/support/update/announcement/2016/suse-su-20162396-1
ubuntu.com/security/CVE-2013-4566
bugzilla.redhat.com/show_bug.cgi?id=CVE-2013-4566